题干
Coming into the room, I found them ______ at the table, _____ chess.
A：seated; playing
B：seating; playing
C：seat; play
D：seated; played
答案(点此获取答案解析）
A
A：seated; playing
B：seating; playing
C：seat; play
D：seated; played
是球O表面上的点，
，
，
，
，则球O的表面积等于 （ ）
上随机取一个数
，使
的值介于
到1之间的概率为( )